Bollettino settimanale


Pagina d'informazione di seminari ed eventi scientifici che avranno luogo settimanalmente per lo più in area romana. Per la pubblicazione rivolgersi a Giorgio Chiarati che ne cura la gestione. Per consultare la pagina di tutti i seminari di Dipartimento Click here.

 

Settimana 20/05/2024 - 24/05/2024

 


 

Seminari

 

Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

 


Geometry Seminar

Date: 21th May 2024
Schedule: 14:30 Rome Time
Where: Conference Room 1101 "C. D'Antoni"
Speaker: Marco D'Addezzio - University of Strasbourg
Title: Edged Crystalline Cohomology "

Abstract: I will talk about a new cohomology theory for algebraic varieties in positive characteristic, called edged crystalline cohomology. This is a generalisation of crystalline cohomology and depends on the choice of a "decay-function''. Linear decay-functions correspond to integral versions of rigid cohomology, while logarithmic decay-functions produce the conjectured family of log-decay crystalline cohomology theories, parametrised by positive real numbers. During the talk, I will explain the construction of this theory after a brief recall of the classical crystalline and rigid cohomology theories.

Note:This talk is part of the activity of the MIUR Excellence Department Projects MathMod@TOV CUP E83C23000330006, and the PRIN 2022 Moduli Spaces and Birational Geometry

Organizing Committee:
Codogni Giulio (Contact Mail)
Lido Guido Maria ( Contact Mail)
Further Information: Click here for geometry webpage
Streaming Link (MS Teams): This seminar will be held in person


Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

 


Operator Algebras Seminar

Date: 22th May 2024
Schedule: 16:00 - Rome Time
Where: Conference Room 1201 "R. Dal Passo"
Title: " Low energy spectrum of the XXZ model coupled to a magnetic field"
Speaker: Alessio Ranallo - University of Geneva

Abstract: I will report on recent developments concerning the control of a class of short-range perturbations of the Hamiltonian of an Ising chain. An example covered by our analysis is the celebrated XXZ chain.
The talk is based on a joint work with S. Del Vecchio, J. Fröhlich, and A. Pizzo.

Note: This talk is part of the activity of the MUR Excellence Department Project MatMod@TOV (CUP E83C23000330006)

Organizing Committee:
Vincenzo Morinelli (mail to contact)
Roberto Longo (mail to contact)
Daniele Guido (mail to contact)
Giuseppe Ruzzi (mail to contact)
Further Info: Click here for Operator Algebras Seminar Page
Streaming Link (MS Teams): This seminar will be held in person


Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

 


Pomeriggio di Meccanica Celeste Seminar

Date: 22th May 2024
Schedule: 14:00 - Rome Time
Where: Conference Room 1201 "C. D'Antoni"
Schedule of Seminar:

First Speaker - 14:00-14:30

Title: "Static and Dynamic tides in the exoplanetary system CoRoT-3b "
Speaker: Sylvio Ferraz-Mello - University Sao Paolo

Abstract: COROT-3 is a system formed by a star and a massive planetary companion (a brown dwarf) with a large stellar obliquity. Notwithstanding the strong tidal interaction of the two bodies, the synchronization of the star rotation has not yet been reached: the stellar rotation is faster than the orbital period. The use of classical tidal evolution models, which do not take into account the stellar obliquity, allowed us to estimate that the stellar tidal relaxation is in the range 40-70 sec^{-1}. The first results obtained with the extension of the creep tide theory to the full 3D problem, taking the stellar obliquity into account, show the tidal bulge oscillating between the two hemispheres. Near the synchronous rotation of the companion, the rotation speed varies around a stationary value and consequently, the lag also changes: the bulge may be lagging behind or advancing the rotation of the planet. The stellar obliquity oscillates around the given initial value while the planetary obliquity, assumed high initially, is damped to a smaller equilibrium value. These results are yet preliminary as they correspond to times of the order of a few thousand years. The resulting high-order system of differential equations is stiff and does not yet allow studies of the evolution over larger spans of time.

Second Speaker - 14:40-15:10

Title: " On Stable Orbits between Jupiter and Saturn "
Speaker: Rudolf Dvorak - University of Vienna

Abstract: Between the giant planets Jupiter and Saturn we have knowledge of some 30 faint asteroids which are moving there on orbits with relative large eccentricities. In some theoretical investigations this domain was studied for asteroids with small eccentricities and many stable regions where found with large escape times up to several hundred million years. Especially bodies with larger inclinations can move there for such long times and even massive planets could stay there on stable orbits. A study concerning retrograde bodies was still missing and therefore we decided to investigate the stability behaviour for massless bodies from vertical moving bodies (i=90 deg) up to i=180 degrees. From older studies in simplified models (e.g. the restricted three body problem) it is well known that retrograde orbits are much more stable then the ones with small inclinations. In the full n-body problem as model for the Solar System we show that from i=135 degrees on the stability behaviour is increasing significantly up to escape times of billions of years. The numerical results achieved with the aid of efficient integrators in a real system underline that these kind of orbits are worth to be taken into account even for extrasolar planetary systems.

Third Speaker - 15:40-16:10

Title: "Dynamical Stability of the Laplace Resonance "
Speaker: Giuseppe Pucacco - Università degli Studi Roma Tor Vergata

Abstract: Classical linear analysis concerning the stability of the Laplace Resonance predict instability beyond a certain threshold in the proximity to the resonance. However, numerical investigations predict Lyapunov stability even very close to the resonance. In this talk is shown how to reconcile these results in the light of a non linear normal-form analysis.

Fourth Speaker - 16:20-16:50

Title: "Spin orbit resonance cascade via core-shell model "
Speaker: Matteo Veglianti - Università degli Studi Roma Tor Vergata

Abstract: We discuss a model describing the spin orbit resonance cascade. We will show how the internal structure of the body and the consequent friction mechanisms are involved in the resonance capture. We find conditions on the parameters for capture and escape from each spin orbit resonance. Finally, we provide an argument for relating the parameters of our model to measurable quantities.

Note: This talk is part of the activity of the MUR Excellence Department Project MatMod@TOV (CUP E83C23000330006)
Note: 15:10 - 15:40 Rome Time, there is a COFFEE BREAK

Organizing Committee:
Christoph Lhotka (mail to contact)
Ugo Locatelli (mail to contact)
Further Info:
Click here for S.I.M.C.A.Page
Click hee for Master in Scienza e Tecnologia Spaziale Page
Streaming Link (MS Teams): This seminar will be held in person


Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

 


DINAMICS SYSTEMS SEMINAR - NEW

Date: 20th May 2024
Schedule: 14:30 - Rome Time
Where: Conference Room "R. Dal Passo"
FIRST SEMINAR - 14:30
Title: " Rare Events and Hitting Time Distribution for Discrete Time Samplings of Stochastic Differential Equations. "
Speaker: Stefano Galatolo - University of Pisa

Abstract: We consider a random discrete time system in which the evolution of a stochastic differential equation is sampled at a sequence of discrete times. We set up a functional analytic framework for which we can prove the existence of a spectral gap and estimate the behavior of the leading eigenvalue of the related transfer operator as the system is perturbed by putting a ”hole” in it that corresponds to a rare event. By doing so, we derive the distribution of the hitting times corresponding to the rare event and the extreme value theory associated with it.
Nota: Questo seminario fa parte delle attività finanziate dal progetto MIUR Dipartimento d'eccellenza MatMod@TOV (2023-27) CUP E83C23000330006
Note: This talk is part of the activity of the MIUR Excellence Department Project MatMod@TOV (2023-27) CUP E83C23000330006

TEA BREAK

SECOND SEMINAR - 16:00
Title: " Every complex Hénon map satisfies the Central Limit Theorem. "
Speaker: Fabrizio Bianchi - University of Pisa

Abstract: Hénon maps were introduced by Michel Hénon as a simplified model of the Poincaré section of the Lorenz model. They are among the most studied discrete-time dynamical systems that exhibit chaotic behaviour. Complex Hénon maps have been extensively studied over the last three decades, in parallel with the development of pluripotential theory. I will present a recent result obtained with Tien-Cuong Dinh, where we show that the measure of maximal entropy of every complex Hénon map is exponentially mixing of all orders for Hölder observables. As a consequence of a recent result by Björklund-Gorodnik, the Central Limit Theorem holds for all Hölder observables.
Nota: Questo seminario fa parte delle attività finanziate dal progetto MIUR Dipartimento d'eccellenza MatMod@TOV (2023-27) CUP E83C23000330006
Note: This talk is part of the activity of the MIUR Excellence Department Project MatMod@TOV (2023-27) CUP E83C23000330006

Organizing Committee:
Leandro Arosio (mail to contact)
Filippo Bracci (mail to contact)
Olver J. Butterley (mail to contact)
Carlangelo Liverani (mail to contact)
Alfonso Sorrentino (mail to contact)
Further Info and Program: Contact Alfonso Sorrentino (Mail )
Streaming Link (MS Teams): This seminar will be held in person


Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

 


RoMaDS - Rome Centre on Mathematics for Modelling and Data ScienceS Seminar

Date: May 22th 2024
Schedule: 14:30 Rome Time
Where: Conference Room R. Dal Passo
Title: " Gaussian Approximation and Bayesian Posterior Distribution in Random Deep Neural Networks "
Speaker: Dario Trevisan - University of Pisa

Abstract: We establish novel rates for the Gaussian approximation of randomly initialized deep neural networks with Gaussian parameters and Lipschitz activation functions, in the so-called wide limit, i.e., where the sizes of all hidden layers become large. Using the Wasserstein metric and related functional analytic tools, we demonstrate the distribution of the output of a network and the corresponding Gaussian approximation are at a distance that scales inversely with the width of the network, surpassing previously established rates. Furthermore, we extend our findings to approximate the exact Bayesian posterior distribution of the network when the likelihood is a bounded Lipschitz function of the network output, on a finite training set. This includes common cases, such as the Gaussian likelihood, which is defined as the exponential of the negative mean squared error. Our inequalities thus shed light on the network's Gaussian behavior by quantitatively capturing the distributional convergence results in the wide limit. The exposition will aim to be self-contained, by introducing all the basic concepts related to artificial neural networks and Bayesian statistics to a mathematical audience. Based on arXiv:2203.07379 (joint with A. Basteri) and arXiv:2312.11737

Organizing Committee:
Domenico Marinucci contact Mail
Michele Salvi contact Mail
Stefano Vigogna contact Mail
Further Info and Program: Click here for RoMaDS event Page

Streaming Link (MS Teams): Link TEAMS Click here


Università degli Studi di Roma "Tor Vergata"
Dipartimento di Matematica

 

Algebra and Representation Theory Seminar

Date: Friday May 24th, 2024
Schedule: 16:00 Rome Time
Where: Conference Room 1101 “C. D'Antoni”
Speaker: Ulrich KRÄHMER - University UT Dresden
Title: "The ring of differential operators on a monomial curve is a Hopf algebroid "
Abstract:

The ring of differential operators on a cuspidal curve whose coordinate ring is a numerical semigroup algebra is shown to be a cocommutative and cocomplete left Hopf algebroid. If the semigroup is symmetric so that the curve is Gorenstein, it is a full Hopf algebroid (admits an antipode). This is based on joint work with Myriam Mahaman.
N.B.:
Note: this talk is part of the activity of the MIUR Excellence Department Project MatMod@TOV (CUP E83C23000330006).

Organizing Committee: Fabio Gavarini (mail to)
Niels Kowalzig (mail to)
Martina Lanini (mail to)
Further Info: Click here for webpage
Streaming Link (MS Teams): This seminar will be held in person


Università degli Studi di Roma "Tor Vergata"
Dipartimento di Matematica

 

Topology Seminar

Date: Friday May 24th, 2024
Schedule: 14:30 - Rome Time
Where: Conference Room 1101 “C. D'Antoni”
Speaker: - Università di Bologna
Title: "Dual Coxeter groups of rank three "
Abstract:

In this presentation, I will discuss the combinatorics of the noncrossing partition posets associated with Coxeter groups of rank three. In particular, I will describe the techniques used to prove the lattice property and lexicographic shellability. These properties can then be used to solve several problems on the corresponding Artin groups, such as the K(π,1) conjecture, the word problem, the center problem, and the isomorphism between standard and dual Artin groups.
This is joint work with Emanuele Delucchi and Mario Salvetti.
N.B.: this talk is part of the activity of the MIUR Excellence Department Project MatMod@TOV (CUP E83C23000330006).

Organizing Committee:
Paolo Salvatore (mail to)
Andrea Pizzi (mail to)
Further Info: Click here for webpage
Streaming Link (MS Teams): This seminar will be held in person



Eventi


 

Università degli Studi di Roma "Tor Vergata"
Dipartimento di Matematica

PhD Course
Optimal control of large systems and mean-field games

Period: 11.04.24 - 20.05.24
Speaker: Prof. Cardaliaguet Pierre - Université Paris Dauphine
Schedule:

11/04/24, 15:00 - 18:00 Aula D'Antoni
15/04/24, 15:00 - 18:00 Aula D'Antoni
18/04/24, 15:00 - 18:00 Aula D'Antoni
22/04/24, 15:00 - 18:00 Aula D'Antoni
02/05/24, 15:00 - 18:00 Aula D'Antoni
06/05/24, 15:00 - 18:00 Aula D'Antoni
13/05/24, 15:00 - 18:00 Aula D'Antoni
15/05/24, 15:00 - 18:00 Aula D'Antoni
20/05/24, 15:00 - 18:00 Aula D'Antoni

Organizing Committee:
Alessio Porretta (Contact Mail for PHD information)
Further Information: Click here for Phd Course Page
Streaming Link (MS Teams): This seminar will be held in person


Università degli Studi di Roma "Tor Vergata"
Dipartimento di Matematica

PhD Course
Criticality theory and nonlinear elliptic equations with local and nonlocal interactions

Period: 07.05.24 - 11.06.24
Speaker: Prof. Vitaly Moroz - Swansea University (U.K.)
Schedule:

07/05/2024, 14-16 - 1201 DAL PASSO - START COURSE
09/05/2024, 11-13 - 1201 DAL PASSO
10/05/2024, 11-13 - AULA A0
13/05/2024, 14-16 - 1201 DAL PASSO
15/05/2024, 11-13 - 1201 DAL PASSO
16/05/2024, 11-13 - 1201 DAL PASSO
17/05/2024, 11-13 - AULA A0
20/05/2024, 14-16 - 1201 DAL PASSO
22/05/2024, 14-16 - AULA 2001
23/05/2024, 11-13 - 1201 DAL PASSO
24/05/2024, 11-13 - 1201 DAL PASSO
04/06/2024, 11-13 - 1201 DAL PASSO
06/06/2024, 11-13 - 1201 DAL PASSO
10/06/2024, 14-16 - 1201 DAL PASSO
11/06/2024, 11-13 - 1201 DAL PASSO

Organizing Committee:
Riccardo Molle (Contact Mail for PHD information)
Further Information: Click here for Phd Course Page
Streaming Link (MS Teams): This seminar will be held in person




 

 

 

 

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